In trying to determine the sphere of influence of a sports centre a random sample of 100
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In trying to determine the sphere of influence of a sports centre a random sample of 100 visitors was taken. This indicated a mean travel distance (d) of 10 miles with a standard deviation of 3 miles:
(a) What are the 90% confidence limits for the population mean travel distance (D),
(b) What sample size would be required to ensure that the confidence interval for D was 0.5 miles at the 95% level?
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a To find the 90 confidence limits for the population mean travel distance D we can use the formula ...View the full answer
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